javafx module javafx.scene.media.AudioClip not found

I'm working on some school projects for a class on NetBeans with TMC. I'm at a point where I'm practicing the use of javafx. Javafx has worked without a hitch until now. I'm trying to "import javafx.scene.media.AudioClips;" and it says the package "javafx.scene.media" does not exist.
If I try to build the project I get these error messages:

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org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project Osa14_08.Hurraa: Compilation failure
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
	at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:185)
	at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:181)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: Compilation failure
	at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:1215)
	at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:188)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
	... 11 more

I have tried to find solutions for this (adding things to pom, download javafx and add it to the JDK), but none have worked. I'm thinking the problem in finding and executing any solution is my level of understanding how these things work.

I am taking the Helsinki Java MOOC course too and ran into the same problem.

In your pom.xml file find the dependency that looks like this,

<dependency>
    <groupId>org.openjfx</groupId>
    <artifactId>javafx-controls</artifactId>
    <version>11.0.2</version>
</dependency>

then add a new dependency under it .

<dependency>
    <groupId>org.openjfx</groupId>
    <artifactId>javafx-media</artifactId>
    <version>11.0.2</version>
</dependency>

Make sure the version number is the same as the javafx-controls dependency version.